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Re: I want know the diffrent....(help me)

1- You are trying on a jacket in a shop. You look in the mirror, and you don't like what you see.

What do you say to yore friend?

"It doesn't look very good, does it?" Correct.

2- You and a friend are wallking over a small wooden bridge. The bridge is very old, and some parts are broken.

What do you say ?

"The bridge isn't very safe , is it?" Correct

Pleasetell me why we use It doesn't in (1) and isn't in (2). What's the difference?

That's an advanced question, and I'm not sure I'll do it justice. But for what it's worth:

Do is a strange but useful verb. It's about activity and often gets combined with other verbs to make them more active: How does it look? She did not sound good. How did it end? Did it end well? Yes, it did end well. How did I do?

Is is simply about a state of being. It sounds passive.

You could rephrase either sentence. To make the first more passive, you could say: "It isn't very good looking, is it?" To give the second a more active sound, you could say: "The bridge doesn't look safe."

So the difference is really just about tone. You probably can't hear the difference yet, but if you continue your English studies for a just a few more years, you will.